Financial Instruments Summary of Estimated Fair Value of Long-term Obligations and Other Short-term Borrowings (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying Amount of Long-Term and other Short-Term Borrowings	$ 4,723	$ 4,701
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value	$ 4,527	$ 4,417